INFO: task syz.4.2164:26363 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2164      state:D stack:25464 pid:26363 tgid:26362 ppid:25973  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd77219cdd9
RSP: 002b:00007fd77309b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fd772415fa0 RCX: 00007fd77219cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000102
RBP: 00007fd772232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd772416038 R14: 00007fd772415fa0 R15: 00007ffee70abfa8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by udevd/5059:
 #0: ffff888102ff9350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xe0/0xd30
2 locks held by getty/5438:
 #0: ffff88816ec7b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
1 lock held by syz.4.2164/26363:
 #0: ffff88810b1a00d8 (&type->s_umount_key#53){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/26612:
1 lock held by syz.3.2531/30181:
 #0: ffff88810b1a00d8 (&type->s_umount_key#53){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.4.2665/31167:
 #0: ffff888115e7e410 (sb_writers#3){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160
 #1: ffff88810b1a00d8 (&type->s_umount_key#53){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.2717/31670:
 #0: ffff88810b1a00d8 (&type->s_umount_key#53){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.2887/540:
2 locks held by syz.1.2884/542:

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 556 Comm: syz.5.2889 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:check_preemption_disabled+0x29/0xe0
Code: 90 55 41 57 41 56 53 65 8b 05 87 4f 90 07 65 8b 0d 7c 4f 90 07 f7 c1 ff ff ff 7f 74 0c 5b 41 5e 41 5f 5d e9 d9 d7 02 00 cc 9c <59> f7 c1 00 02 00 00 74 ea 65 4c 8b 3d 2e 4f 90 07 41 f6 47 2f 04
RSP: 0018:ffffc90004b17748 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000080000000
RDX: 0000000000000000 RSI: ffffffff8dfc04dd RDI: ffffffff8c28af60
RBP: ffffffff82399fe3 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff940008ed849 R12: 0000000000000002
R13: ffffffff8e95cd60 R14: 0000000000000000 R15: 0000000000000246
FS:  00007fe8df5f66c0(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe8d7fff000 CR3: 000000018620a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0xcd/0x350
 charge_memcg+0x40/0x2b0
 __mem_cgroup_charge+0x25/0x80
 shmem_alloc_and_add_folio+0x7cd/0xf80
 shmem_get_folio_gfp+0x5a9/0x1670
 shmem_write_begin+0x16c/0x330
 generic_perform_write+0x2e2/0x8f0
 shmem_file_write_iter+0xf8/0x120
 vfs_write+0x61d/0xb90
 ksys_write+0x150/0x270
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe8e135d60e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007fe8df5f5da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fe8df5f66c0 RCX: 00007fe8e135d60e
RDX: 0000000001000000 RSI: 00007fe8d7000000 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 00007fe8df5f5ee0 R14: 00007fe8df5f5ea0 R15: 00007fe8d7000000
 </TASK>
